I learned to swim in Onion Creek.  My dad, Doc McCormick, even forged Onion Creek one stormy night to deliver a baby.  My own 14 grandchildren delight in fishing and swimming in the creek.  They love nothing more than swinging on a rope from one of the big cypress trees into the creek.   My concern is the proposed wastewater discharge into the creek from Dripping Springs could put an end to fishing and swimming in the creek.     Water quality experts warn that the phosphates and nitrates p...